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Flashcards in Development of head and neck Deck (51)
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1

In week 4, what proportion of the embryo is made up of the future head and neck?

Half of it

2

What is the structure of the face of the embryo at week 4 of development?

No structure, completely undeveloped

3

What is the structure of the head and neck of the embryo in early development?

Frontonasal prominence in the head

Pharyngeal arches

4

Why is the frontonasal prominence named so?

At the front of the embryo

Where nose develops

Prominent because of developing brain behind it

5

How many pharyngeal arches are there in the embryo in early development?

5 of them
but are numbered 1, 2, 3, 4, 6

6

What is a pharyngeal arch made up of?

Mesenchymal proliferation
-mesoderm with some neural crest cells

Inner endoderm lining
Outer ectoderm lining

7

What does the mesenchyme in the pharyngeal arch develop into?

Cartilage bar

Muscle

Artery

8

What supplies a pharyngeal arch?

Each pharyngeal arch has its own blood supply
and is innervated by its own cranial nerve

9

Which pharyngeal arch is the biggest?

1st pharyngeal arch

10

How do the pharyngeal arches change in size?

Get smaller from the 1st pharyngeal arch to the 6th pharyngeal arch

11

How does the number of derivatives of the pharyngeal arches change? Why?

Fewer derivatives from the 1st pharyngeal arch to the 6th pharyngeal arch
because they get smaller

12

What are the parts of the 1st pharyngeal arch?

Maxillary zone

Mandibular zone

13

Which cranial nerves innervate the pharyngeal arches?

CNs 5, 7, 9, 10

14

Which cranial nerve innervates the 1st pharyngeal arch?

CN5 trigeminal nerve

15

Which cranial nerve innervates the 2nd pharyngeal arch?

CN7 facial nerve

16

Which cranial nerve innervates the 3rd pharyngeal arch?

CN9 glossopharyngeal nerve

17

Which cranial nerve innervates the 4th pharyngeal arch?

CN10 vagus nerve

18

Which cranial nerve innervates the 6th pharyngeal arch?

CN10 vagus nerve

19

Which muscles does the 1st pharyngeal arch give rise to?

Muscles of mastication

20

Which muscles does the 2nd pharyngeal arch give rise to?

Muscles of facial expression

21

Which muscles does the 3rd pharyngeal arch give rise to?

Stylopharyngeus

22

Which muscles does the 4th pharyngeal arch give rise to?

Pharyngeal muscles

23

Which muscles does the 6th pharyngeal arch give rise to?

Laryngeal muscles

24

What is the cartilage bar of the 1st pharyngeal arch called?

Meckel's cartilage

25

What bones does Meckel's cartilage develop into?

Malleus, incus

Template for mandible

26

What is the cartilage bar of the 2nd pharyngeal arch called?

Reichert's cartilage

27

What bones does Riechert's cartilage develop into?

Stapes

Upper part of hyoid bone

Styloid process

28

What bones does the cartilage bar of the 3rd pharyngeal arch develop into?

Rest of hyoid bone

29

What does the cartilage bar of the 4th pharyngeal arch develop into?

Larynx cartilages
-thyroid
-cricoid
-aretynoid

30

What does the cartilage bar of the 6th pharyngeal arch develop into?

Larynx cartilages
-thyroid
-cricoid
-aretynoid